Solved

Comparing ArrayList elements with Hash map Keys

Posted on 2009-07-01
1
2,710 Views
Last Modified: 2013-12-22
I have a arraylist and hash map .
I want wen ever there is matching in arraylst elemtns and hashmap keys
corresponding vales sud be put in a new list.
The values of HashMap is list.
My given codeis failing somewhere between.
Please check..
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
 
 
public class test5
{
	public ArrayList<String> getData(HashMap<String, ArrayList<String>> AMap,ArrayList<String> temp)
	{
		
		System.out.println(" Invloking getData ");
		Set<String> tempSet = new HashSet<String>(temp);
        System.out.println("getData "+tempSet);
        Set commonKeys = new HashSet(AMap.keySet());
        ArrayList<String> ruleGroupIds = new ArrayList<String>(commonKeys);
        commonKeys.retainAll( tempSet );
 	    System.out.println(commonKeys);
	 	for (Object key : commonKeys) 
	     {
		      ArrayList<String>  value = (ArrayList<String>) AMap.get(key);
	 	      ruleGroupIds.addAll(value);
  	     }
	 	System.out.println("result " + ruleGroupIds);
 	    return ruleGroupIds;
	}
	public static void main(String args[])
	{
		ArrayList<String> compareList = new ArrayList<String>();
		compareList.add("A");	compareList.add("B");	compareList.add("D");
		ArrayList<String> superList = new ArrayList<String>();
		ArrayList<String> ruleGroupIds = new ArrayList<String>();
		ArrayList<String> ruleGroupIdsss = new ArrayList<String>();
		ruleGroupIdsss.add("1234");ruleGroupIdsss.add("12345");
		superList.add("A");superList.add("B");superList.add("C");superList.add("E");//superList.add("D");
 
		HashMap<String, ArrayList<String>> hm = new HashMap<String, ArrayList<String>>();
		hm.put("B",ruleGroupIdsss);hm.put("D",ruleGroupIdsss);hm.put("A",ruleGroupIdsss);hm.put("E",ruleGroupIdsss);
		hm.put("C",ruleGroupIdsss);
		
		test5 t = new test5();
		t.getData(hm, compareList);
	}
}

Open in new window

0
Comment
Question by:satyabrata25
1 Comment
 
LVL 3

Accepted Solution

by:
serrutom earned 250 total points
ID: 24753291

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Set;
 
public class Test5 {
	public static void main(String args[]) {
		ArrayList<String> listA = new ArrayList<String>();
		listA.add("A");
		listA.add("B");
		listA.add("D");
 
		HashMap<String, String> listB = new HashMap<String, String>();
		listB.put("A", "Test A");
		listB.put("B", "Test B");
		listB.put("C", "Test C");
		listB.put("D", "Test D");
		listB.put("E", "Test E");
 
		Test5 t = new Test5();
 
		List<String> newList = new ArrayList();
		Set<String> keys = listB.keySet();
		for (String key : keys) {
			if(listA.contains(key)) {
				newList.add(listB.get(key));
			}
		}
		
		for(String s : newList) {
			System.out.println(s);
		}
	}
}

Open in new window

0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
MySQL  on Tomcat 8 69
how to see all occupied ports on windows 10 laptop 15 77
How to convert from xls to xlsx using java 7 55
Java: The Public Class Main 4 32
By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
Viewers learn about the third conditional statement “else if” and use it in an example program. Then additional information about conditional statements is provided, covering the topic thoroughly. Viewers learn about the third conditional statement …
Viewers learn how to read error messages and identify possible mistakes that could cause hours of frustration. Coding is as much about debugging your code as it is about writing it. Define Error Message: Line Numbers: Type of Error: Break Down…

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question